Charles, right, thank you. I was trying to recall Tonian Labs name.IIRC Tonian no longer carries the PHY product. He used to be the importer. Samuel Furon of Ocellia has taken over PHY. He has an office in Canada and does distribution from there.
Since the bass can be handled by a subwoofer, its really only important that a full range driver make it to something less than 70Hz or so. That is why I find the 6" PHY appealing, since it can do that (in the right cabinet) with fairly smooth highs. Duke LeJeurne designed a sealed box for this speaker which also employed a pair of rear-firing Fostex tweeters. The main driver had no crossover. I did some pink noise measurements and that design made it to 70Hz fairly well- no leaness, and the rear-firing tweeters helped it with not being beamy in the highs. PHY has a rear-loaded horn design for their 8" and 6" drivers; I'm hoping to hear one of those fairly soon.